Why is so difficult to find a white top?

I am Moroccan and I like men of all colors and sizes and I am 99% bottom,the idea of penetrating a man doesn't arouse me and I always wanted to have experiences with European tops but I have never found any white top who likes to penetrate non-white men butts,all Europeans who flirt with me are usually bottoms like me and I don't understand why,is it because we're seen as more masculine or our skin more harsh?Can any white top tell me why?